Organoboron compounds. Part VIII. Aliphatic and aromatic diboronic acids
作者:I. G. C. Coutts、H. R. Goldschmid、O. C. Musgrave
DOI:10.1039/j39700000488
日期:——
Diboronic acids (HO)2B·R·B(OH)2(where R = polymethylene, arylene, or thiophen-2,5-diyl) are prepared by reactions of methyl borate with difunctional Grignard reagents and are characterised by the formation of cyclic esters with various diols. The polymethylenediboronic acids are much more resistant to aerial oxidation than are the corresponding alkylboronic acids. All the diboronic acids undergo dehydration
Selective Formal Carbene Insertion into Carbon‐Boron Bonds of Diboronates by
<i>N</i>
‐Trisylhydrazones
作者:Zhicheng Bao、Meirong Huang、Yan Xu、Xinhao Zhang、Yun‐Dong Wu、Jianbo Wang
DOI:10.1002/anie.202216356
日期:2023.2.20
Intermolecular reaction of N-trisylhydrazones with bis (boryl) methane led to the transformation of 1,1-diboronate into 1,2-bis(boronates) via 1,2-borylmethyl migration. With unsymmetric diboronates with two different boryl moieties, the reaction proceeded with excellent regioselectivity. DFT studies reveal an unusual neighbouring boryl group effect that accounts for the observed regioselectivity.